Bug #14865: Raising exception in c_return event hook causes infinite loop

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.6.0dev (2018-06-23) [x86_64-linux]
• Backport: 2.3: WONTFIX, 2.4: DONE, 2.5: DONE

[ktsj (Kazuki Tsujimoto)]

c_returnのイベントフックの中で例外を起こすと無限ループになるケースがあります。
例外発生時にフレームがポップされずスタックに残り続けてしまうのが原因です。

$ cat t.rb
TracePoint.new(:c_return){|tp|
  p tp.method_id
  raise
}.enable{
  tap{ itself }
}
$ ruby t.rb
:itself
:tap
:tap
(snip)

[ktsj (Kazuki Tsujimoto)]

• Status changed from Open to Closed

Applied in changeset trunk|r63727.

---

vm.c: fix infinite loop

• vm.c: use EXEC_EVENT_HOOK_AND_POP_FRAME. While exception handling, if an exception
  is raised in hooks, need to pop current frame and raise this raised exception by hook.

[ruby-dev:50582] [Bug #14865]

[usa (Usaku NAKAMURA)]

• Backport changed from 2.3: WONTFIX, 2.4: REQUIRED, 2.5: REQUIRED to 2.3: WONTFIX, 2.4: DONE, 2.5: REQUIRED

ruby_2_4 r64129 merged revision(s) 63727.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.3: WONTFIX, 2.4: DONE, 2.5: REQUIRED to 2.3: WONTFIX, 2.4: DONE, 2.5: DONE

ruby_2_5 r64438 merged revision(s) 63727.